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Java > Open Source Codes > org > jfree > chart > needle > ShipNeedle


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public License
20  * along with this library; if not, write to the Free Software Foundation,
21  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
24  * in the United States and other countries.]
25  *
26  * ---------------
27  * ShipNeedle.java
28  * ---------------
29  * (C) Copyright 2002-2005, by the Australian Antarctic Division and
30  * Contributors.
31  *
32  * Original Author: Bryan Scott (for the Australian Antarctic Division);
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: ShipNeedle.java,v 1.4 2005/05/19 15:42:54 mungady Exp $
36  *
37  * Changes:
38  * --------
39  * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
40  * 27-Mar-2003 : Implemented Serializable (DG);
41  * 09-Sep-2003 : Added equals() method (DG);
42  *
43  */
44
45 package org.jfree.chart.needle;
46
47 import java.awt.Graphics2D JavaDoc;
48 import java.awt.geom.Arc2D JavaDoc;
49 import java.awt.geom.GeneralPath JavaDoc;
50 import java.awt.geom.Point2D JavaDoc;
51 import java.awt.geom.Rectangle2D JavaDoc;
52 import java.io.Serializable JavaDoc;
53
54 /**
55  * A needle in the shape of a ship, for use with the
56  * {@link org.jfree.chart.plot.CompassPlot} class.
57  *
58  * @author Bryan Scott
59  */
60 public class ShipNeedle extends MeterNeedle implements Serializable JavaDoc {
61
62     /** For serialization. */
63     private static final long serialVersionUID = 149554868169435612L;
64     
65     /**
66      * Draws the needle.
67      *
68      * @param g2 the graphics device.
69      * @param plotArea the plot area.
70      * @param rotate the rotation point.
71      * @param angle the angle.
72      */
73     protected void drawNeedle(Graphics2D JavaDoc g2, Rectangle2D JavaDoc plotArea,
74                               Point2D JavaDoc rotate, double angle) {
75
76         GeneralPath JavaDoc shape = new GeneralPath JavaDoc();
77         shape.append(new Arc2D.Double JavaDoc(
78             -9.0, -7.0, 10, 14, 0.0, 25.5, Arc2D.OPEN), true
79         );
80         shape.append(new Arc2D.Double JavaDoc(
81             0.0, -7.0, 10, 14, 154.5, 25.5, Arc2D.OPEN), true
82         );
83         shape.closePath();
84         getTransform().setToTranslation(plotArea.getMinX(), plotArea.getMaxY());
85         getTransform().scale(plotArea.getWidth(), plotArea.getHeight() / 3);
86         shape.transform(getTransform());
87
88         if ((rotate != null) && (angle != 0)) {
89             /// we have rotation
90 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
91             shape.transform(getTransform());
92         }
93
94         defaultDisplay(g2, shape);
95     }
96
97     /**
98      * Tests another object for equality with this object.
99      *
100      * @param object the object to test.
101      *
102      * @return A boolean.
103      */
104     public boolean equals(Object JavaDoc object) {
105         if (object == null) {
106             return false;
107         }
108         if (object == this) {
109             return true;
110         }
111         if (super.equals(object) && object instanceof ShipNeedle) {
112             return true;
113         }
114         return false;
115     }
116
117 }
118
119
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